157. Subject to sections 146 and 147, the gate positions following the scratching of a horse that was to take part in the race are established as follows:(1) where a horse that must start in a race in the first line is withdrawn, the withdrawal has no impact on the position of the horses that are to start in the second line;
(2) where a horse is withdrawn from any of the start lines, the horses outside the post position of the horse withdrawn fill the gap by getting nearer to the inside of the racing strip.